Move ConfigMapping classes to integrate with SmallRyeConfig.

implementation/pom.xml

@@ -75,6 +75,11 @@
       <artifactId>jboss-logging-processor</artifactId>
     </dependency>
 
+    <dependency>
+      <groupId>org.ow2.asm</groupId>
+      <artifactId>asm</artifactId>
+    </dependency>
+
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter</artifactId>

implementation/src/main/java/io/smallrye/config/SmallRyeConfig.java

@@ -45,6 +45,8 @@
 
 import io.smallrye.common.annotation.Experimental;
 import io.smallrye.config.SmallRyeConfigBuilder.InterceptorWithPriority;
+import io.smallrye.config.mapper.ConfigMapping;
+import io.smallrye.config.mapper.ConfigurationValidationException;
 
 /**
  * @author <a href="http://jmesnil.net/">Jeff Mesnil</a> (c) 2017 Red Hat inc.
@@ -200,6 +202,26 @@ public <T, C extends Collection<T>> Optional<C> getOptionalValues(String name, C
         return getOptionalValue(name, Converters.newCollectionConverter(converter, collectionFactory));
     }
 
+    @Experimental("TODO")
+    public <T> T getConfigProperties(Class<T> klass) {
+        return getConfigProperties(klass, "");
+    }
+
+    @Experimental("TODO")
+    public <T> T getConfigProperties(Class<T> klass, String prefix) {
+        final ConfigMapping configMapping = ConfigMapping.builder()
+                .addRoot(prefix, klass)
+                .build();
+
+        try {
+            final ConfigMapping.Result result = configMapping.mapConfiguration(this);
+            return result.getConfigRoot(prefix, klass);
+        } catch (ConfigurationValidationException e) {
+            e.printStackTrace();
+            throw new IllegalArgumentException(e.getCause());
+        }
+    }
+
     @Override
     public Iterable<String> getPropertyNames() {
         final HashSet<String> names = new HashSet<>();

implementation/src/test/java/io/smallrye/config/mapper/ConfigMappingTest.java

@@ -0,0 +1,35 @@
+package io.smallrye.config.mapper;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+import io.smallrye.config.KeyValuesConfigSource;
+import io.smallrye.config.SmallRyeConfig;
+import io.smallrye.config.SmallRyeConfigBuilder;
+
+public class ConfigMappingTest {
+    @Test
+    void configMapping() {
+        final SmallRyeConfig config = buildConfig("server.host", "localhost", "server.port", "8080");
+        final ConfigsInterface configProperties = config.getConfigProperties(ConfigsInterface.class, "server");
+        //assertEquals("localhost", configProperties.getHost());
+        assertEquals("localhost", configProperties.host());
+        //assertEquals(8080, configProperties.getPort());
+        assertEquals(8080, configProperties.port());
+    }
+
+    interface ConfigsInterface {
+        String host();
+
+        int port();
+    }
+
+    private static SmallRyeConfig buildConfig(String... keyValues) {
+        return new SmallRyeConfigBuilder()
+                .addDefaultSources()
+                .addDefaultInterceptors()
+                .withSources(KeyValuesConfigSource.config(keyValues))
+                .build();
+    }
+}